Dictionary:

ti¹

  (tē)

The seventh tone in the diatonic scale in solfeggio.

[Alteration of SI.]

An eastern Asian tropical shrub (Cordyline terminalis) having a terminal tuft of long narrow leaves and panicles of white, yellowish, or reddish flowers.

[Tahitian and Maori tī.]

The noun has 2 meanings:

Meaning #1: shrub with terminal tufts of elongated leaves used locally for thatching and clothing; thick sweet roots are used as food; tropical southeastern Asia, Australia and Hawaii
  Synonym: Cordyline terminalis

Meaning #2: the syllable naming the seventh (subtonic) note of any musical scale in solmization
  Synonyms: te, si